4518729 has 6 divisors (see below), whose sum is σ = 6527066. Its totient is φ = 3012480.

The previous prime is 4518691. The next prime is 4518737. The reversal of 4518729 is 9278154.

It can be written as a sum of positive squares in only one way, i.e., 4210704 + 308025 = 2052^2 + 555^2 .

It is not a de Polignac number, because 4518729 - 2⁷ = 4518601 is a prime.

It is a Duffinian number.

4518729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4518693 and 4518702.

It is not an unprimeable number, because it can be changed into a prime (4518739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 251032 + ... + 251049.

Almost surely, 2^4518729 is an apocalyptic number.

It is an amenable number.

4518729 is a deficient number, since it is larger than the sum of its proper divisors (2008337).

4518729 is a wasteful number, since it uses less digits than its factorization.

4518729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502087 (or 502084 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 4518729 is about 2125.7302274748. The cubic root of 4518729 is about 165.3250891043.

It can be divided in two parts, 451 and 8729, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 4518729 in words is "four million, five hundred eighteen thousand, seven hundred twenty-nine".